Bolted Pressure Switch

Are the main disconnecting means at your facility 480 volt bolted pressure switches?

Do you maintain them annually?

Of all the problems we see in electrical power distribution failures, the bolted pressure switch seems to be the one device which fails most. Without proper maintenance, the operating mechanism may not close or worse, not open and fail to operate the switch. Another common switch problem is the main contacts welding together from overheating or the associated ground fault device not operating the switch.